Addding nitrogen to tires

I am going to butt into this thread because there is a hazard that might concern the type of folks that are reading this type thread. As far as the nitrogen goes, in my opinion, its not a big thing. HOWEVER, a really BIG thing are sealers, flat-fixers, or OTC tire inflators that contain an inflammable product as propellant! Most of these have been taken off the market, but there are still some to be found on counter, especially in discount stores and such. If and when a unsuspecting tire changer opens a tire containing one of these products, it can be disaster! So just be aware, and if you should need to use one of these products, please check it before putting it in your tires!